JP3738509B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device used for, for example, a dust seal for a bearing of a roll for a continuous casting machine.
[0002]
[Prior art]
As a conventional sealing device of this type, for example, a device as shown in FIG. 3 is known. That is, the sealing device 100 is used to prevent foreign matters such as dust and cooling water (hereinafter referred to as dust) from entering the bearing 102 of the roll shaft 101a of the roll 101 for the continuous casting machine from the roll body 101b side. Therefore, the intrusion of foreign matter from the open side 107 is double-sealed by two sealing members 104 and 105 arranged in the axial direction.
[0003]
A liquid lubricant 106 such as grease or oil supplied to the bearing 102 is provided for the purpose of lubricating the lip sliding surfaces of the seal lips 104a and 105a of the seal members 104 and 105 and preventing them from being damaged by foreign matter. After the lubricating action of the bearing 102 is performed, the seal lips 104a and 105a are slid along the path indicated by the arrow A101 from the back side (left side in the drawing) of the first seal member 104 to the seal members. The surface was lubricated and dust that entered between the contact surfaces with the roll shaft 101a was discharged in the direction of arrow A102.
[0004]
Further, in the seal member 203 in FIG. 4, dust enters the bearing 202 provided at the end of the continuous casting machine roll 201 similar to the continuous casting machine roll 101 from the end 201 a side of the continuous casting machine roll 201. It is used to prevent it from happening.
[0005]
The seal member 203 is integrally provided with a main lip 203a made of a rubber-like elastic member and a dust lip 203b disposed outside the main lip 203a. 3, the liquid lubricant 106 such as grease or oil supplied to the bearing 202 is lubricated by the bearing 202, and then the back side of the seal member 203 along the path indicated by the arrow A201. (The right side in the figure), the sliding surfaces of the main lip 203a and the dust lip 203b were lubricated, and the dust that entered between the contact surfaces with the end 201a was discharged in the direction of arrow A202.
[0006]
[Problems to be solved by the invention]
However, any of the above-described conventional sealing devices has a sealed state or dust due to the viscosity characteristics of the liquid lubricant 106 (depending on the viscosity characteristics, a phenomenon occurs in which the liquid lubricant becomes highly viscous and difficult to flow at low temperatures) and the amount of lubrication. It may affect the discharge.
[0007]
Accordingly, when the dust discharge performance is reduced and the foreign matter cannot be sufficiently washed away, residual dust is generated in the vicinity of the outer seal lip 105a and the dust lip 203b, and the outer seal lip 105a and the dust lip 203b are damaged. In addition, dust may enter the space 108 between the seal members 104 and 105 and the lip 203c.
[0008]
Then, dust that has entered the space 108 or between the lips 203c bites into the lip sliding surface, causing premature wear of the seal lip and the sliding surface of the shaft, thereby reducing the sealing performance. As a result, dust or the like enters the bearing. May occur, causing a problem of bearing damage due to rust, deterioration of rotational accuracy, or the like.
[0009]
Further, it is conceivable to increase the supply pressure and supply amount of the liquid lubricant 106 supplied to the bearing with the aim of improving the lubrication and dust discharge performance of the seal member. Since it is an elastic member and has low rigidity, it is difficult to adjust the lip valve opening amount by pressurization, and the amount of consumption of the liquid lubricant 106 increases, and the risk of dust intrusion at the same time when the lip valve is opened. Sex must be considered.
[0010]
The present invention has been made to solve the above-described problems of the prior art, and its object is to improve the durability of the lip and improve the retention capacity of the lubricant to increase the amount of lubricant consumed. It is an object of the present invention to provide a sealing device that can reduce the lip damage of the sealing device and maintain the sealing performance for a long period of time.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a bearing sealing device for a roll for a continuous casting machine, which seals between a fixed seal housing and a rotating roll shaft. The annular fixed portion fixed to the seal housing and the outer peripheral surface of the roll shaft are in slidable sealing contact, and are arranged on the sealing side to which the lubricant is supplied and on the upstream side of the flow of the lubricant. A first seal member and a second seal member slidably sealed against the outer peripheral surface of the roll shaft and disposed on the dust side and the downstream side of the flow of the lubricant. The seal member is a resin seal ring having a sliding surface that comes into contact with the outer peripheral surface of the roll shaft, and the second seal member is a seal lip made of a rubber-like elastic body . the outer peripheral side, da lubricant supplied from the sealed side A rubber-like elastic body that provides an urging force for generating a pressing force against the outer peripheral surface of the roll shaft of the seal ring while making it impossible to communicate with the outer peripheral surface of the roll shaft other than a sliding surface that contacts the outer peripheral surface of the roll shaft An annular urging member, and the annular fixed portion extends from the first axial portion and one end of the first axial portion so as to approach the roll shaft. A rubber-like elastic body fitting portion formed on the first reinforcement ring and the seal lip are integrally provided around the first reinforcement ring, and A second axial portion that is superimposed on the roll axis side of the first axial portion of the first reinforcing ring and a side opposite to the side on which the first radial portion of the second axial portion extends. A second reinforcing ring having a second radial portion extending from one end so as to approach the roll axis. With obtaining these first, first second reinforcing rings, first and second axial portions, a region surrounded by the second radial portion to the holding chamber of the seal ring, the seal ring in the holding chamber A front end side of the first radial portion toward the roll axis by curving the first radial portion of the first reinforcing ring halfway toward the sealing side. portions forming a space dust side of the first radial portion Intention to sealing side, the seal lip tip of the seal lip toward the outer circumferential surface of the b Lumpur axis inclined dust side in the space The sliding surface of the seal ring is provided with a sliding groove that allows the lubricant supplied from the sealing side to be discharged to the dust side.
[0012]
According to this, the infiltration of dust is prevented by the second seal member, and even if the dust intrudes from the second seal member to the first seal member, the first seal member has a lubricant on the sliding surface. Since the lip rigidity is high and the dust does not easily enter the sliding surface and is not easily damaged by the dust because it is composed of a resin seal ring at the same time. Can be increased. And with respect to the change in the supply pressure of the lubricant supplied from the sealing side, there is little change in the opening amount of the sliding surface due to the rigidity of the first seal member, and the amount of lubricant communication is stable, Excessive consumption of lubricant can be suppressed.
[0014]
According to this, the axial position of the resin seal ring is determined by the two radial portions forming the holding chamber, and the sliding surface is pressed against the other member by the annular urging member made of a rubber-like elastic body. Force is generated to form a uniform and stable sealed contact in the annular direction. The annular urging member can prevent communication of the lubricant supplied from the sealing side in the holding chamber to the dust side from other than the sliding surface.
[0016]
With this sliding groove, it is possible to reliably supply the lubricant to the sliding surface of the seal ring, and new lubricant is always supplied to the sliding surface at a predetermined ratio and is held on the sliding surface. Since the lubricant is discharged, the sliding surface can be maintained in a clean state, and the durability of the seal ring can be improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
( Reference example )
A reference example will be described below with reference to FIG. FIG. 1A shows an example of a sealing device 1 according to a reference example , and FIG. A sealing device 1 according to a reference example in FIG. 1B is in sliding contact with a roll shaft 2a of a roll 2 of a continuous casting machine or the like, similar to the sealing device described in the section of the prior art. A case where dust intrudes from the dust side space D into the dust side space D is prevented will be described as an example (a side opposite to the dust side space D is a sealed side space M).
[0018]
This sealing device 1 seals between a fixed seal housing 4 as one member of two members assembled so as to be relatively rotatable concentrically with each other and a rotating roll shaft 2a as the other member. It is fitted and fixed to the inner peripheral surface of a cylindrical mounting cap 4b that is fixed to the opening end surface 4a of the seal housing 4 with a bolt 4c or the like.
[0019]
The sealing device 1 includes a first reinforcing ring 11 having a substantially L-shaped cross section including an axial direction portion 11a and a radial direction 11b protruding inward from one end of the axial direction portion 11a. A rubber-like elastic fitting portion 11c and a dust lip 11d as a second seal member are integrally formed.
[0020]
A second reinforcing ring 12 is fitted inside the axial portion 11 a of the first reinforcing ring 11. The second reinforcing ring 12 has a substantially L-shaped cross section including an axial direction portion 12a and a radial direction 12b protruding inward from one end of the axial direction portion 12a so that the radial direction 11b and the radial direction 12b are separated from each other. After the axial direction portion 12a is fitted inside the axial direction portion 11a of the reinforcing ring 11, the end portion 11e of the axial direction portion 11a of the reinforcing ring 11 is bent and fixed inside.
[0021]
Accordingly, the first and second reinforcing rings 11 and 12 are joined to form a reinforcing ring 13 having a substantially U-shaped cross section with the inside opened. The inner region of the reinforcing ring 13 functions as a holding chamber H that holds a resinous seal ring 14 as a first seal member.
[0022]
The seal ring 14 has a rectangular cross section, and includes a sliding surface 14a having a parallel portion that seals and contacts the inner peripheral surface with the outer peripheral surface of the roll shaft 2a.
[0023]
As the material of the seal ring 14, a resin material having a low sliding resistance and excellent wear resistance against dust is selected. For example, a fluorine-based resin such as PTFE (tetrafluoroethylene resin) can be used. The resin material such as PTFE may be filled with various fillers such as glass fiber, graphite, and carbon fiber depending on the application. Of course, not only these resin materials but various other materials can be selected.
[0024]
An annular rubber ring 15 made of a rubber-like elastic body serving as an urging member for applying an urging force for generating the pressing force of the sliding surface 14 a of the seal ring 14 to the seal ring 14 is contained in the holding chamber H. It arrange | positions at the outer peripheral side and is urging | biasing the direction which reduces the diameter of the seal ring 14 of the inner peripheral side. The rubber ring 15 and the seal ring 14 may have a configuration in which separate members are fitted, or a configuration in which the rubber ring 15 and the seal ring 14 are integrally joined by adhesion or the like.
[0025]
The rubber ring 15 and the seal ring 14 are assembled into the holding chamber H by placing them inside the second reinforcing ring 12 before fitting the first reinforcing ring 11 and the second reinforcing ring 12 together. This is possible by a method of incorporating, or after fitting the first reinforcing ring 11 and the second reinforcing ring 12, each of them is bent to deform the shape and incorporated into the holding chamber H.
[0026]
The portion of the seal housing 4 that holds the bearing 3 is provided with an oil supply hole 4d, and a lubricant L such as grease is supplied to the bearing 3 at a predetermined pressure. The lubricant L is supplied to the sealing device 1 along the path indicated by the arrow A1 after the bearing 3 is lubricated.
[0027]
Next, the operation of the sealing device 1 will be described. The dust lip 11d prevents the dust from entering from the dust side space D. Even if dust enters the seal ring 14 side from the dust lip 11d, the lubricant L is held on the sliding surface 14a of the seal ring 14. At the same time, since it is made of a resin such as PTFE, the lip rigidity is high and dust does not easily enter the sliding surface 14a and is not easily damaged by dust, so that the sealing performance and durability of the seal ring 14 can be improved. .
[0028]
Then, with respect to a change in the supply pressure of the lubricant L supplied from the sealed side space M due to a pressure change in the sealed side space M, etc., there is little change in the opening amount of the sliding surface 14a due to the rigidity of the seal ring 14 and lubrication. Since the communication amount of the agent L is also stable, excessive consumption of the lubricant L can be suppressed.
[0029]
The axial position of the seal ring 14 is determined by the holding chamber H, and the elastic force of the sliding surface 14a against the roll shaft 2a is uniformly generated in the annular direction by the rubber ring 15 to form a stable sealed contact state. The rubber ring 15 can prevent the lubricant L supplied from the sealed space M in the holding chamber H from communicating with the dust side space D from other than the sliding surface 14a.
[0030]
Here, the reinforcing ring 13 forms the holding chamber H by combining the two reinforcing rings 11, 12, but may have an integral configuration with a U-shaped cross section.
[0031]
(In the form state of implementation)
Figure 2 is a diagram illustrating the implementation of the embodiment of the present invention. The sealing device 21 has the same basic configuration as that of the reference example, and the same components are denoted by the same reference numerals. A characteristic part of the sealing device 21 includes a sliding groove 22 on the sliding surface 14a of the seal ring 14 that enables a small amount of the lubricant L supplied from the sealing side space M to be discharged into the dust side space D. ing.
[0032]
In this embodiment, the sliding groove 22 has an iris pattern. However, the sliding groove 22 is not particularly limited to this shape, and may be one that extends obliquely in the annular direction or a spiral shape.
[0033]
The operation of the sealing device 21 ensures that the sliding surface 14a is lubricated by the sliding groove 22, and a new lubricant L is always supplied to the sliding surface 14a at a predetermined ratio, and the sliding surface 14a. Since the lubricant L held in the cylinder is discharged, the sliding surface 14a can always be kept clean, wear of the seal ring 14 and the roll shaft 2a can be reduced, and the sealing device 21 can be reduced. It is possible to maintain a stable sealing performance for a long time.
[0034]
【The invention's effect】
As described above, according to the present invention, the second seal member prevents dust from entering, and even if dust enters from the second seal member to the first seal member, the first seal Since the member holds the lubricant on the sliding surface and at the same time is made of a resin seal ring, the lip rigidity is high and dust does not easily enter the sliding surface. Maintenance and durability of the seal can be improved.
[0035]
And with respect to the change in the supply pressure of the lubricant supplied from the sealing side, there is little change in the opening amount of the sliding surface due to the rigidity of the first seal member, and the amount of lubricant communication is stable, Since excessive consumption of the lubricant can be suppressed, damage to the lip of the sealing device can be reduced and the sealing performance can be maintained for a long period of time.
[0036]
By providing an annular biasing member in the holding chamber, the axial position of the resin seal ring is determined by two radial portions forming the holding chamber, and the annular biasing member made of a rubber-like elastic body is used. A tension force of the sliding surface against the other member is generated to form a uniform and stable sealed contact state in the annular direction. The annular urging member can prevent communication of the lubricant supplied from the sealing side in the holding chamber to the dust side from other than the sliding surface.
[0037]
By providing a sliding groove on the sliding surface of the resin seal ring, it is possible to reliably supply the lubricant to the sliding surface of the seal ring, and a new lubricant is always supplied at a predetermined rate. And the lubricant held on the sliding surface is discharged, so that the sliding surface can be kept clean and durability of the seal ring can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional configuration explanatory view of a sealing device according to a reference example .
FIG. 2 is a cross-sectional configuration explanatory view of a sealing device according to an embodiment of the present invention .
FIG. 3 is an explanatory view of a cross-sectional configuration of a conventional sealing device.
FIG. 4 is a cross-sectional configuration explanatory diagram of a conventional sealing device.

Claims (1)

A sealing device for a bearing of a roll for a continuous casting machine, which seals between a fixed seal housing and a rotating roll shaft, an annular fixed portion fixed to the seal housing, and a roll shaft Slidably and slidably contact the outer peripheral surface of the first seal member and the outer peripheral surface of the roll shaft disposed on the sealing side to which the lubricant is supplied and on the upstream side of the flow of the lubricant. A second sealing member that is movably hermetically sealed and disposed on the dust side and the downstream side of the lubricant flow;
The first seal member is a resin seal ring having a sliding surface in contact with the outer peripheral surface of the roll shaft.
The second seal member is a seal lip made of a rubber-like elastic body,
The outer peripheral side of the seal ring, while a impossible to communicate to the dust side of the lubricant supplied from the sealed side than the sliding surface in contact with the outer peripheral surface of the roll shaft, the roll axis of the sealing ring An annular urging member made of a rubber-like elastic body that gives an urging force for generating a tension force on the outer peripheral surface;
The annular fixing portion includes a first reinforcing ring having a first axial portion and a first radial portion extending from one end of the first axial portion so as to approach the roll shaft. A fitting portion of a rubber-like elastic body formed on the first reinforcing ring and the seal lip are integrally provided around the first reinforcing ring, and the first reinforcing ring includes the first reinforcing ring. The second axial direction portion overlapped on the roll axis side of the axial direction portion and the roll shaft from one end opposite to the side where the first radial direction portion of the second axial direction portion extends is approached. And a second reinforcing ring having a second radial portion extending in the direction and surrounded by the first and second axial portions and the first and second radial portions of the first and second reinforcing rings. The area is a holding chamber for the seal ring,
The biasing member is provided on the outer peripheral side of the seal ring in the holding chamber,
By curving the first radial portion of the first reinforcing ring halfway toward the sealing side, the tip side portion of the first radial portion toward the roll shaft side is brought closer to the sealing side and the first radial portion is moved toward the sealing side. a space is formed dust side of the radial portion, said sealing lip tip of the seal lip toward the outer circumferential surface of the b Lumpur axis is inclined to the dust side in the space,
A sealing device comprising a sliding groove on a sliding surface of the seal ring, which allows a lubricant supplied from a sealing side to be discharged to a dust side.

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